JP7497567B2 - Drain pile - Google Patents

Drain pile Download PDF

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JP7497567B2
JP7497567B2 JP2019194384A JP2019194384A JP7497567B2 JP 7497567 B2 JP7497567 B2 JP 7497567B2 JP 2019194384 A JP2019194384 A JP 2019194384A JP 2019194384 A JP2019194384 A JP 2019194384A JP 7497567 B2 JP7497567 B2 JP 7497567B2
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filter member
pile
water intake
water
intake hole
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JP2021067121A (en
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伯浩 菅野
伸哉 福場
直紀 佐藤
竜一 張ヶ谷
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Tokyo Electric Power Co Holdings Inc
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Tokyo Electric Power Co Inc
Tokyo Electric Power Co Holdings Inc
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Description

本発明は、ドレーン杭に関する。 The present invention relates to a drain pile.

液状化対策として、多数の吸水孔が形成された管状のドレーン杭を、杭の上部が地上に露出するように地盤に打ち込む工法が知られている。地震時には、地中の水が吸水孔から杭内に流入し、上部の排出口から地上に排出されることで、過剰間隙水圧が低減され、液状化が抑制される。 One known method of preventing liquefaction is to drive tubular drain piles with numerous water intake holes into the ground so that the tops of the piles are exposed above ground. During an earthquake, water from within the ground flows into the piles through the water intake holes and is discharged to the ground from the outlet at the top, reducing excess pore water pressure and suppressing liquefaction.

ドレーン杭では、吸水孔から土砂が流入して杭が詰まることを防止する必要がある。吸水孔から土砂が流入することを防止する機構としては、管の内側に網目状のフィルタを設ける機構が知られている。例えば、特許文献１には、多数の吸水孔が穿設された内管と外管との間に、土砂の流入を抑制するための網目状のフィルタを設けることが開示されている。 In drain piles, it is necessary to prevent soil from flowing in through the suction holes and clogging the pile. A known mechanism for preventing soil from flowing in through the suction holes is to provide a mesh filter on the inside of the pipe. For example, Patent Document 1 discloses providing a mesh filter between an inner pipe with multiple suction holes and an outer pipe to prevent soil from flowing in.

特許第２６６３５７９号公報Japanese Patent No. 2663579

しかし、特許文献１のような従来のドレーン杭は、構造が複雑でコストが高く、また管とフィルタの隙間から土砂が流入しやすく、液状化を抑制する効果が低下しやすい。 However, conventional drain piles such as those in Patent Document 1 have a complex structure, are expensive, and soil and sand can easily flow in through the gap between the pipe and the filter, reducing their effectiveness in preventing liquefaction.

本発明は、構造が簡単でコストが低く、土砂の流入を抑制する効果が高いドレーン杭を提供することを目的とする。 The present invention aims to provide a drain pile that is simple in structure, low in cost, and highly effective in preventing soil inflow.

本発明は、以下の構成を有する。
［１］地盤に埋め込む管状のドレーン杭であって、
周壁部に１つ以上の吸水孔を有する杭本体と、土砂の流入を抑制するためのフィルタ部材と、を備え、
前記フィルタ部材が前記吸水孔に嵌め込まれている、ドレーン杭。
［２］前記フィルタ部材の通水部にメッシュ部材が設けられている、［１］に記載のドレーン杭。
［３］前記フィルタ部材の通水部にスリットが形成されている、［１］に記載のドレーン杭。 The present invention has the following configuration.
[1] A tubular drain pile to be embedded in the ground,
The pile body has one or more water suction holes in a peripheral wall portion, and a filter member for suppressing the inflow of soil and sand.
A drain pile, wherein the filter member is fitted into the water intake hole.
[2] A drain pile as described in [1], in which a mesh member is provided in the water-passing portion of the filter member.
[3] A drain pile as described in [1], in which a slit is formed in the water passage portion of the filter member.

本発明によれば、構造が簡単でコストが低く、土砂の流入を抑制する効果が高いドレーン杭を提供できる。 The present invention provides a drain pile that is simple in structure, low in cost, and highly effective in preventing soil inflow.

本発明の第１実施形態のドレーン杭の一例を示した正面図である。FIG. 2 is a front view showing an example of a drain pile according to the first embodiment of the present invention. 図１のドレーン杭のフィルタ部材が設けられた部分を拡大した正面図である。FIG. 2 is an enlarged front view of a portion of the drain pile in FIG. 1 where a filter member is provided. 図１のドレーン杭が備えるフィルタ部材を示した斜視図である。FIG. 2 is a perspective view showing a filter member provided in the drain pile of FIG. 1 . 図３のフィルタ部材のＡ－Ａ断面図である。4 is a cross-sectional view of the filter member of FIG. 3 taken along line AA. 本発明の第２実施形態のドレーン杭のフィルタ部材が設けられた部分を拡大した正面図である。FIG. 11 is an enlarged front view of a portion of a drain pile according to a second embodiment of the present invention where a filter member is provided. 図５のドレーン杭が備えるフィルタ部材を示した斜視図である。FIG. 6 is a perspective view showing a filter member provided in the drain pile of FIG. 5 . 図６のフィルタ部材のＢ－Ｂ断面図である。7 is a cross-sectional view of the filter member of FIG. 6 taken along the line BB.

以下、本発明のドレーン杭の一例を示して説明する。なお、以下の説明において例示される図の寸法等は一例であって、本発明はそれらに必ずしも限定されるものではなく、その要旨を変更しない範囲で適宜変更して実施することが可能である。 The following describes an example of a drain pile of the present invention. Note that the dimensions of the figures shown in the following description are merely examples, and the present invention is not necessarily limited to them. Appropriate modifications can be made without departing from the gist of the present invention.

＜第１実施形態＞
図１及び図２に示すように、第１実施形態のドレーン杭１は、管状の杭本体１０と、上部水抜き材２０と、フィルタ部材３０と、を備えている。上部水抜き材２０は、杭本体１０の上端に接続されている。フィルタ部材３０は、杭本体１０の周壁部１２に形成された複数の吸水孔１４のそれぞれに嵌め込まれている。
ドレーン杭１は、地中の水を地上に排出するための杭であり、上部水抜き材２０の上部が部分的に地上に露出するように地盤に埋め込まれる。 First Embodiment
1 and 2 , the drain pile 1 of the first embodiment includes a tubular pile body 10, an upper drainage material 20, and a filter member 30. The upper drainage material 20 is connected to the upper end of the pile body 10. The filter member 30 is fitted into each of a plurality of water intake holes 14 formed in the peripheral wall portion 12 of the pile body 10.
The drain pile 1 is a pile for draining underground water to the surface, and is embedded in the ground so that the upper part of the upper water drainage material 20 is partially exposed above ground.

杭本体１０の形状は、この例では円筒状である。なお、杭本体１０の形状は、円筒状には限定されず、四角筒状等であってもよい。地盤への埋め込みが容易な点では、杭本体１０は円筒状が好ましい。 In this example, the shape of the pile body 10 is cylindrical. Note that the shape of the pile body 10 is not limited to a cylindrical shape and may be a square tube shape, etc. A cylindrical shape for the pile body 10 is preferable because it is easier to embed the pile body 10 in the ground.

杭本体１０の下端部１６は、下端に向かうにしたがって徐々に縮径する円錐状になっている。また、杭本体１０の下端には開口が形成されておらず、下端部１６は閉じた状態になっている。杭本体１０の下端部１６がこのような形態であれば、ドレーン杭１を地盤に打ち込みやすく、また杭本体１０の下端部１６から土砂が流入することを抑制できる。なお、杭本体１０の下端部１６は円錐状には限定されず、本発明の効果を損なわない範囲であれば下端が開口していてもよい。 The lower end 16 of the pile body 10 is cone-shaped, with the diameter gradually decreasing toward the bottom end. In addition, no opening is formed at the bottom end of the pile body 10, and the bottom end 16 is closed. If the bottom end 16 of the pile body 10 has such a shape, the drain pile 1 can be easily driven into the ground, and soil can be prevented from flowing in from the bottom end 16 of the pile body 10. The bottom end 16 of the pile body 10 is not limited to a cone shape, and the bottom end may be open as long as it does not impair the effects of the present invention.

杭本体１０の外径は、６０～９０ｍｍが好ましく、７０～８０ｍｍがより好ましい。
杭本体１０の内径は、５５～８７ｍｍが好ましく、６５～７７ｍｍがより好ましい。
杭本体１０の長さは、適宜設定でき、例えば２５００～４０００ｍｍとすることができる。 The outer diameter of the pile body 10 is preferably 60 to 90 mm, and more preferably 70 to 80 mm.
The inner diameter of the pile body 10 is preferably 55 to 87 mm, and more preferably 65 to 77 mm.
The length of the pile body 10 can be set appropriately, for example, to 2500 to 4000 mm.

杭本体１０の周壁部１２には、複数の吸水孔１４が形成されている。例えば、ドレーン杭１を地盤に埋め込んだ状態で地震が起きたときには、地中の水が各々の吸水孔１４から杭本体１０内に流入し、上部水抜き材２０を通じて地上に排出される。一般に、地中の水は表層にはあまり存在せず深い層に存在するため、複数の吸水孔１４は杭本体１０の下端部１６寄りに設けられている。杭本体１０の長さ方向における吸水孔１４の位置は、ドレーン杭１を適用する地盤に応じて適宜設定すればよい。 A number of water intake holes 14 are formed in the peripheral wall 12 of the pile body 10. For example, when an earthquake occurs with the drain pile 1 embedded in the ground, water in the ground flows into the pile body 10 through each water intake hole 14 and is discharged to the ground through the upper water drainage material 20. Generally, water in the ground is not found much in the surface layer but in deeper layers, so the multiple water intake holes 14 are provided near the lower end 16 of the pile body 10. The position of the water intake holes 14 in the longitudinal direction of the pile body 10 may be set appropriately according to the ground to which the drain pile 1 is applied.

複数の吸水孔１４の配置パターンとしては、杭本体１０の強度がより高くなる点から、周壁部１２の外周面を平面に展開したときに各々の吸水孔１４が千鳥状に配置されているパターンが好ましい。なお、複数の吸水孔１４の配置パターンは、このような千鳥状には限定されない。 The arrangement pattern of the multiple water intake holes 14 is preferably a pattern in which the individual water intake holes 14 are arranged in a staggered pattern when the outer circumferential surface of the peripheral wall portion 12 is unfolded in a plane, as this increases the strength of the pile body 10. However, the arrangement pattern of the multiple water intake holes 14 is not limited to this staggered pattern.

ドレーン杭の下側（例えば、下端部１６からドレーン杭全長の１／３の範囲）の周壁部１２の外周面の総面積に対する、複数の吸水孔１４の開口面積の合計の割合を杭本体１０の開口率Ｑとする。このとき、開口率Ｑは、２～５％が好ましい。開口率Ｑが前記下限値以上であれば、地中の水を地上に排出しやすい。開口率Ｑが前記上限値以下であれば、強度が高いドレーン杭１としやすい。 The ratio of the total opening area of the multiple water intake holes 14 to the total area of the outer peripheral surface of the peripheral wall portion 12 on the lower side of the drain pile (for example, within the range from the lower end 16 to 1/3 of the total length of the drain pile) is the opening ratio Q of the pile body 10. In this case, the opening ratio Q is preferably 2 to 5%. If the opening ratio Q is equal to or greater than the lower limit, underground water is easily discharged to the surface. If the opening ratio Q is equal to or less than the upper limit, it is easy to obtain a drain pile 1 with high strength.

吸水孔１４の正面視形状は、この例では円形状である。なお、吸水孔１４の正面視形状は、円形状には限定されず、例えば、矩形状等であってもよい。
吸水孔１４の寸法は、前記開口率Ｑを満たすように設定することが好ましい。例えば、吸水孔１４の正面視形状が円形状の場合、正面視での吸水孔１４の直径は、１５～３０ｍｍが好ましい。 In this example, the shape of the water intake hole 14 in a front view is circular. However, the shape of the water intake hole 14 in a front view is not limited to a circular shape and may be, for example, a rectangular shape or the like.
The dimensions of the water intake hole 14 are preferably set so as to satisfy the opening ratio Q. For example, when the shape of the water intake hole 14 is circular when viewed from the front, the diameter of the water intake hole 14 when viewed from the front is preferably 15 to 30 mm.

吸水孔１４の数は、前記開口率Ｑを満たすように設定することが好ましい。吸水孔１４の数は、例えば、２０～３０個とすることができる。 It is preferable to set the number of water intake holes 14 so as to satisfy the opening ratio Q. The number of water intake holes 14 can be, for example, 20 to 30.

杭本体１０の材質は、特に限定されず、例えば、鉄、ステンレス鋼等の金属、硬質ポリ塩化ビニル、ポリエチレン、ポリプロピレン等の樹脂を例示できる。強度が高く、地中への打ち込みが容易な点では、杭本体１０の材質は金属が好ましい。杭本体１０の材質は、１種であってもよく、２種以上であってもよい。
杭本体１０の製造方法は、特に限定されず、公知の方法を利用できる。 The material of the pile body 10 is not particularly limited, and examples thereof include metals such as iron and stainless steel, and resins such as rigid polyvinyl chloride, polyethylene, and polypropylene. Metal is preferable as the material of the pile body 10 in terms of high strength and ease of driving into the ground. The material of the pile body 10 may be one type or two or more types.
The method for manufacturing the pile body 10 is not particularly limited, and any known method can be used.

上部水抜き材２０は、上端が開口した筒状の部材であり、杭本体１０の上端に接続されている。杭本体１０内に流入した水は、上部水抜き材２０の上端開口部２２から排出される。この例の上部水抜き材２０は、長さ方向の中央部が上端に向かうにしたがって縮径し、それよりも上側部分が細い管状になっている。なお、上部水抜き材２０の形状は、この例の形状には限定されない。 The upper drainage material 20 is a tubular member with an open upper end, and is connected to the upper end of the pile body 10. Water that flows into the pile body 10 is discharged from the upper end opening 22 of the upper drainage material 20. In this example, the upper drainage material 20 has a central portion in the length direction that tapers toward the upper end, and the portion above that is tubular and narrow. Note that the shape of the upper drainage material 20 is not limited to the shape in this example.

上部水抜き材２０の寸法は、特に限定されず、適宜設定できる。
杭本体１０と上部水抜き材２０との接続構造は、特に限定されず、例えば、螺合による接続が挙げられる。また、杭本体１０と上部水抜き材２０とは、一体に成形されたものであってもよい。 The dimensions of the upper drainage material 20 are not particularly limited and can be set as appropriate.
The connection structure between the pile body 10 and the upper drainage material 20 is not particularly limited, and may be, for example, a connection by screwing. In addition, the pile body 10 and the upper drainage material 20 may be integrally formed.

上部水抜き材２０の材質は、特に限定されず、例えば、鉄、ステンレス鋼等の金属、硬質ポリ塩化ビニル、ポリエチレン、ポリプロピレン等の樹脂を例示できる。加工性の点では、上部水抜き材２０の材質は樹脂製が好ましい。上部水抜き材２０の材質は、１種であってもよく、２種以上であってもよい。
上部水抜き材２０の製造方法は、特に限定されず、射出成形等の公知の成形方法を利用できる。 The material of the upper water drainage material 20 is not particularly limited, and examples thereof include metals such as iron and stainless steel, and resins such as rigid polyvinyl chloride, polyethylene, and polypropylene. From the viewpoint of workability, the material of the upper water drainage material 20 is preferably made of resin. The material of the upper water drainage material 20 may be one type or two or more types.
The method for manufacturing the upper drainage member 20 is not particularly limited, and a known molding method such as injection molding can be used.

フィルタ部材３０は、土砂の流入を抑制するための嵌め込み型の透水性部材であり、各吸水孔１４に嵌め込まれている。
この例のフィルタ部材３０は、図３及び図４に示すように、吸水孔１４に嵌め込まれる円筒状の嵌込部３２と、嵌込部３２の先端部に取り付けられた円板状の蓋部３４と、メッシュ部材３６と、を備えている。蓋部３４の中央部分は円形状に開口した通水部３８になっており、その通水部３８に円形状のメッシュ部材３６が設けられている。例えば、地震が起きたときには、地中の水がメッシュ部材３６を通じて吸水孔１４から杭本体１０内に流入し、土砂はメッシュ部材３６によって杭本体１０内への流入が抑制される。 The filter member 30 is a fitting-type water-permeable member for preventing the inflow of soil and sand, and is fitted into each water intake hole 14 .
3 and 4, the filter member 30 of this example includes a cylindrical fitting portion 32 that is fitted into the water intake hole 14, a disk-shaped lid portion 34 attached to the tip of the fitting portion 32, and a mesh member 36. The central portion of the lid portion 34 is a water passage portion 38 that opens in a circular shape, and a circular mesh member 36 is provided in the water passage portion 38. For example, when an earthquake occurs, underground water flows from the water intake hole 14 into the pile body 10 through the mesh member 36, and the flow of soil and sand into the pile body 10 is suppressed by the mesh member 36.

フィルタ部材３０の通水部３８にメッシュ部材３６を設ける機構は特に限定されない。この例では、嵌込部３２の先端部にメッシュ部材３６が設置された状態で、嵌込部３２の先端部に蓋部３４が螺合によって取り付けられ、メッシュ部材３６が嵌込部３２と蓋部３４で挟持されている。
フィルタ部材３０の形状は、この例の形状には限定されず、吸水孔１４の形状に合わせて適宜設定することができる。 There is no particular limitation on the mechanism for providing the mesh member 36 in the water passage portion 38 of the filter member 30. In this example, with the mesh member 36 installed at the tip of the fitting portion 32, the lid portion 34 is attached to the tip of the fitting portion 32 by screwing, and the mesh member 36 is sandwiched between the fitting portion 32 and the lid portion 34.
The shape of the filter member 30 is not limited to the shape in this example, and can be set appropriately in accordance with the shape of the water intake hole 14 .

この例のフィルタ部材３０では、嵌込部３２の外面に、蓋部３４側から嵌込部３２の軸方向に延びる複数のリブ３２ａが周方向に間隔をあけて設けられている。これにより、フィルタ部材３０を吸水孔１４にしっかりと嵌め込むことができる。例えば、ハンマー等でフィルタ部材３０を吸水孔１４に打ち込むことで、フィルタ部材３０を吸水孔１４に設けることができる。
フィルタ部材３０のリブ３２ａは、蓋部３４から遠ざかるにつれて低くなっていることが好ましい。これにより、フィルタ部材３０を吸水孔１４に打ち込むことが容易になる。 In the filter member 30 of this example, a plurality of ribs 32a extending from the lid portion 34 side in the axial direction of the fitting portion 32 are provided at intervals in the circumferential direction on the outer surface of the fitting portion 32. This allows the filter member 30 to be firmly fitted into the water intake hole 14. For example, the filter member 30 can be installed in the water intake hole 14 by driving the filter member 30 into the water intake hole 14 with a hammer or the like.
It is preferable that the ribs 32a of the filter member 30 become lower as they move away from the cover portion 34. This makes it easier to drive the filter member 30 into the water intake hole 14.

フィルタ部材３０の寸法は、強度等を考慮して適宜設定すればよい。
嵌込部３２の厚みは、例えば、１～３ｍｍとすることができる。
リブ３２ａの高さは、例えば、１～２ｍｍとすることができる。
リブ３２ａの幅は、例えば、１～４ｍｍとすることができる。
蓋部３４の厚みは、例えば、１～３ｍｍとすることができる。 The dimensions of the filter member 30 may be appropriately set in consideration of strength and the like.
The thickness of the fitting portion 32 may be, for example, 1 to 3 mm.
The height of the rib 32a may be, for example, 1 to 2 mm.
The width of the rib 32a may be, for example, 1 to 4 mm.
The thickness of the lid portion 34 can be, for example, 1 to 3 mm.

嵌込部３２及び蓋部３４の材質は、特に限定されず、例えば、硬質ポリ塩化ビニル、ポリエチレン、ポリプロピレン等の樹脂を例示できる。強度が高く、地中での耐久性に優れる点では、フィルタ部材３０の材質は硬質ポリ塩化ビニルが好ましい。嵌込部３２及び蓋部３４の材質は、１種であってもよく、２種以上であってもよい。
嵌込部３２及び蓋部３４の製造方法は、特に限定されず、射出成形等の公知の成形方法を利用できる。 The material of the fitting portion 32 and the lid portion 34 is not particularly limited, and examples thereof include resins such as rigid polyvinyl chloride, polyethylene, and polypropylene. In terms of high strength and excellent durability underground, rigid polyvinyl chloride is preferable as the material of the filter member 30. The material of the fitting portion 32 and the lid portion 34 may be one type or two or more types.
The manufacturing method of the fitting portion 32 and the lid portion 34 is not particularly limited, and a known molding method such as injection molding can be used.

メッシュ部材３６の材質としては、特に限定されず、例えば、ステンレス鋼（ＳＵＳ）を例示できる。
メッシュ部材３６の目開きは、ドレーン杭１を埋め込む地盤の土砂のサイズに応じて、土砂の流入を抑制できる範囲で適宜設定すればよい。例えば、土砂のサイズが０．０７５～２ｍｍの地盤は地震によって液状化しやすく、このような地盤にドレーン杭１を埋め込む場合には２００番（目開き０．０７０ｍｍ程度）のメッシュ部材を使用できる。 The material of the mesh member 36 is not particularly limited, and may be, for example, stainless steel (SUS).
The mesh size of the mesh member 36 may be set appropriately within a range that can suppress the inflow of sediment, depending on the size of the soil in the ground in which the drain pile 1 is embedded. For example, soil with a size of 0.075 to 2 mm is prone to liquefaction due to an earthquake, and when embedding the drain pile 1 in such ground, a mesh member with a mesh size of 200 (mesh size of about 0.070 mm) can be used.

ドレーン杭１の用途は、特に限定されず、例えば、地震時の液状化対策が挙げられる。具体的には、例えば、電柱やマンホールの周囲に複数本のドレーン杭１を埋め込むことにより、地震時に液状化現象によって電柱が倒れたり、マンホールが地上に露出したりすることを抑制することができる。 The uses of the drain pile 1 are not particularly limited, and examples include measures against liquefaction during earthquakes. Specifically, for example, by burying multiple drain piles 1 around utility poles and manholes, it is possible to prevent utility poles from collapsing and manholes from being exposed above ground due to liquefaction during an earthquake.

以上説明したドレーン杭１にあっては、杭本体１０の吸水孔１４にフィルタ部材３０が嵌め込まれているため、吸水孔１４において杭本体１０とフィルタ部材３０の間に隙間が生じにくい。これにより、土砂の流入を十分に抑制することができ、杭本体１０が土砂で詰まりにくいため、地中の水を地上に排出する効果が十分に発揮される。また、吸水孔１４にフィルタ部材３０を嵌め込むだけのため、構造が簡単で低コストであり、既存の杭本体１０に対しても容易に土砂流入抑制効果を付与できる。 In the drain pile 1 described above, the filter member 30 is fitted into the water intake hole 14 of the pile body 10, so gaps are unlikely to occur between the pile body 10 and the filter member 30 at the water intake hole 14. This makes it possible to sufficiently suppress the inflow of soil and sand, and the pile body 10 is unlikely to become clogged with soil and sand, so the effect of draining underground water to the surface is fully exerted. In addition, since the filter member 30 is simply fitted into the water intake hole 14, the structure is simple and low cost, and the effect of suppressing soil inflow can be easily imparted to existing pile bodies 10.

＜第２実施形態＞
図５に示すように、第２実施形態のドレーン杭２は、管状の杭本体１０と、上部水抜き材２０と、フィルタ部材４０と、を備えている。
ドレーン杭２は、フィルタ部材３０の代わりにフィルタ部材４０を備えている以外は、ドレーン杭１と同じ態様である。ドレーン杭２におけるドレーン杭１と同じ部分は同符号を付して説明を省略する。 Second Embodiment
As shown in FIG. 5 , the drain pile 2 of the second embodiment includes a tubular pile body 10 , an upper drainage material 20 , and a filter member 40 .
The drain pile 2 has the same configuration as the drain pile 1, except that the drain pile 2 includes a filter member 40 instead of the filter member 30. The same parts of the drain pile 2 as those of the drain pile 1 are denoted by the same reference numerals and will not be described.

フィルタ部材４０は、土砂の流入を抑制するための嵌め込み型の透水性部材であり、各吸水孔１４に嵌め込まれている。
この例のフィルタ部材４０は、図６及び図７に示すように、吸水孔１４に嵌め込まれる円筒状の嵌込部４２と、嵌込部４２の先端部に取り付けられた円板状の蓋部４４と、を備えている。蓋部４４の中央部分は通水部４６であり、複数のスリット４８が互いに平行に形成されている。例えば、地震が起きたときには、地中の水がスリット４８を通じて吸水孔１４から杭本体１０内に流入し、土砂はスリット４８を通過せず杭本体１０内への流入が抑制される。 The filter member 40 is a fitting-type water-permeable member for preventing the inflow of soil and sand, and is fitted into each water intake hole 14 .
6 and 7, the filter member 40 of this example includes a cylindrical fitting portion 42 that is fitted into the water intake hole 14, and a disk-shaped lid portion 44 attached to the tip of the fitting portion 42. The central portion of the lid portion 44 is a water passage portion 46, in which a plurality of slits 48 are formed parallel to one another. For example, when an earthquake occurs, underground water flows from the water intake hole 14 into the pile body 10 through the slits 48, while soil does not pass through the slits 48 and is prevented from flowing into the pile body 10.

フィルタ部材４０の形状は、この例の形状には限定されず、吸水孔１４の形状に合わせて適宜設定することができる。
この例のフィルタ部材４０では、嵌込部４２の外面に、蓋部４４側から嵌込部４２の軸方向に延びる複数のリブ４２ａが周方向に間隔をあけて設けられている。これにより、フィルタ部材４０を吸水孔１４にしっかりと嵌め込むことができる。例えば、ハンマー等でフィルタ部材４０を吸水孔１４に打ち込むことで、フィルタ部材４０を吸水孔１４に設けることができる。 The shape of the filter member 40 is not limited to the shape in this example, and can be set appropriately in accordance with the shape of the water intake hole 14 .
In the filter member 40 of this example, a plurality of ribs 42a extending from the lid portion 44 side in the axial direction of the fitting portion 42 are provided at intervals in the circumferential direction on the outer surface of the fitting portion 42. This allows the filter member 40 to be securely fitted into the water intake hole 14. For example, the filter member 40 can be installed in the water intake hole 14 by driving the filter member 40 into the water intake hole 14 with a hammer or the like.

フィルタ部材４０のリブ４２ａは、蓋部４４から遠ざかるにつれて低くなっていることが好ましい。これにより、フィルタ部材４０を吸水孔１４に打ち込むことが容易になる。 The ribs 42a of the filter member 40 are preferably lower as they move away from the lid portion 44. This makes it easier to insert the filter member 40 into the water intake hole 14.

スリット４８の幅は、ドレーン杭２を埋め込む地盤の土砂のサイズに応じて、土砂の流入を抑制できる範囲で適宜設定すればよい。
各々のスリット４８の表面４４ａ側の幅ｄ１（図５、図７）は、０．５～２．０ｍｍが好ましく、０．５～１．０ｍｍがより好ましい。スリット４８の幅ｄ１が前記下限値以上であれば、地中の水を地上に排出しやすい。スリット４８の幅ｄ１が前記上限値以下であれば、土砂が杭本体１０内に流入することを抑制しやすい。 The width of the slit 48 may be set appropriately within a range that can prevent the inflow of soil and sand, depending on the size of the soil and sand in the ground where the drain pile 2 is embedded.
The width d1 (FIGS. 5 and 7) of each slit 48 on the surface 44a side is preferably 0.5 to 2.0 mm, and more preferably 0.5 to 1.0 mm. If the width d1 of the slit 48 is equal to or greater than the lower limit, underground water is easily discharged to the surface. If the width d1 of the slit 48 is equal to or less than the upper limit, soil is easily prevented from flowing into the pile body 10.

図７に示すように、蓋部４４をスリット４８の幅方向に切断したときのスリット４８の断面形状は、スリット４８の幅が蓋部４４の表面４４ａ側から裏面４４ｂ側に向かって広がっている。具体的には、スリット４８の断面形状は、蓋部４４の表面４４ａから裏面４４ｂ側に向かうにつれて幅が漸次広がる部分と、幅が一定の部分とからなる形状である。スリット４８の断面形状がこのような形状であれば、土砂がスリット４８に挟まったとしてもスリット４８から外れやすくなる。
なお、スリット４８の幅は、表面４４ａから裏面４４ｂに向かって段階的に広がっていてもよく、表面４４ａから裏面４４ｂに向かって徐々に広がっていてもよい。スリット４８の幅は、表面４４ａから裏面４４ｂまで一定であってもよい。 7, when the lid portion 44 is cut in the width direction of the slit 48, the cross-sectional shape of the slit 48 has a width that increases from the front surface 44a side to the back surface 44b side of the lid portion 44. Specifically, the cross-sectional shape of the slit 48 is a shape consisting of a portion whose width gradually increases from the front surface 44a to the back surface 44b side of the lid portion 44, and a portion whose width is constant. If the cross-sectional shape of the slit 48 is such a shape, even if soil becomes caught in the slit 48, it will be easy to remove it from the slit 48.
The width of the slit 48 may be increased stepwise from the front surface 44a to the back surface 44b, or may be increased gradually from the front surface 44a to the back surface 44b. The width of the slit 48 may be constant from the front surface 44a to the back surface 44b.

各々のスリット４８の裏面側の幅ｄ２（図７）は、１．０～２．５ｍｍが好ましく、１．０～１．５ｍｍがより好ましい。スリット４８の幅ｄ２が前記下限値以上であれば、地中の水を地上に排出しやすい。スリット４８の幅ｄ２が前記上限値以下であれば、土砂が杭本体１０内に流入することを抑制しやすい。 The width d2 (Figure 7) of the back side of each slit 48 is preferably 1.0 to 2.5 mm, and more preferably 1.0 to 1.5 mm. If the width d2 of the slit 48 is equal to or greater than the lower limit, underground water is easily discharged to the surface. If the width d2 of the slit 48 is equal to or less than the upper limit, soil is easily prevented from flowing into the pile body 10.

各々のスリット４８の長さは、２～４ｍｍが好ましく、２～３ｍｍがより好ましい。スリット４８の長さが前記下限値以上であれば、フィルタ部材４０が充分な強度となりやすい。スリット４８の長さが前記上限値以下であれば、水が流入する際にスリット４８に土砂が挟まっても、その土砂が取れやすくなるため、スリット４８が詰まりにくくなる。 The length of each slit 48 is preferably 2 to 4 mm, and more preferably 2 to 3 mm. If the length of the slit 48 is equal to or greater than the lower limit, the filter member 40 is likely to have sufficient strength. If the length of the slit 48 is equal to or less than the upper limit, even if soil becomes trapped in the slit 48 when water flows in, the soil is easily removed, and the slit 48 is less likely to become clogged.

吸水孔１４の開口面積に対する、複数のスリット４８の開口面積の合計の割合をフィルタ部材４０の開口率Ｐとする。このとき、開口率Ｐは、３０～６０％が好ましく、５０～６０％がより好ましい。開口率Ｐが前記下限値以上であれば、地中の水を地上に排出しやすい。開口率Ｐが前記上限値以下であれば、土砂が杭本体１０内に流入することを抑制しやすい。 The ratio of the total opening area of the multiple slits 48 to the opening area of the water intake hole 14 is the opening rate P of the filter member 40. In this case, the opening rate P is preferably 30 to 60%, and more preferably 50 to 60%. If the opening rate P is equal to or greater than the lower limit, underground water is easily discharged to the surface. If the opening rate P is equal to or less than the upper limit, it is easy to prevent soil from flowing into the pile body 10.

スリット４８の数は、前記開口率Ｐを満たすように設定することが好ましい。スリット４８の数は、例えば、４～８個とすることができる。 It is preferable to set the number of slits 48 so as to satisfy the aperture ratio P. The number of slits 48 can be, for example, 4 to 8.

フィルタ部材４０の寸法は、強度等を考慮して適宜設定すればよく、例えば、嵌込部４２の厚み、リブ４２ａの高さ、幅、蓋部４４の厚みは、フィルタ部材３０で例示した寸法と同様の寸法とすることができる。 The dimensions of the filter member 40 may be set appropriately taking into consideration strength, etc. For example, the thickness of the fitting portion 42, the height and width of the rib 42a, and the thickness of the lid portion 44 may be the same as the dimensions exemplified for the filter member 30.

フィルタ部材４０が杭本体１０の吸水孔１４に設けられた状態における、フィルタ部材４０を正面視したときのスリット４８の長さ方向と、杭本体１０の軸方向とがなす角度を角度θとする。このとき、角度θは、０～１０°が好ましく、０～５°がより好ましい。角度θが前記範囲内であれば、水が流入する際にスリット４８に土砂が挟まっても、その土砂が取れやすくなるため、スリット４８が詰まりにくくなる。 The angle θ is the angle between the length direction of the slit 48 when the filter member 40 is viewed from the front and the axial direction of the pile body 10 when the filter member 40 is installed in the water intake hole 14 of the pile body 10. In this case, the angle θ is preferably 0 to 10°, and more preferably 0 to 5°. If the angle θ is within the above range, even if soil becomes trapped in the slit 48 when water flows in, the soil is easily removed, and the slit 48 is less likely to become clogged.

フィルタ部材４０の材質としては、特に限定されず、例えば、嵌込部３２及び蓋部３４の材質として例示したものと同じものを例示できる。フィルタ部材４０の材質は、１種であってもよく、２種以上であってもよい。
フィルタ部材４０の製造方法は、特に限定されず、射出成形等の公知の成形方法を利用できる。 The material of the filter member 40 is not particularly limited, and may be, for example, the same material as that exemplified for the fitting portion 32 and the lid portion 34. The material of the filter member 40 may be one type or two or more types.
The method for manufacturing the filter member 40 is not particularly limited, and a known molding method such as injection molding can be used.

以上説明したドレーン杭２にあっては、杭本体１０の吸水孔１４にフィルタ部材４０が嵌め込まれているため、吸水孔１４において杭本体１０とフィルタ部材４０の間に隙間が生じにくい。これにより、土砂の流入を十分に抑制することができ、杭本体１０が土砂で詰まりにくいため、地中の水を地上に排出する効果が十分に発揮される。また、吸水孔１４にフィルタ部材４０を嵌め込むだけのため、構造が簡単で低コストであり、既存の杭本体１０に対しても容易に土砂流入抑制効果を付与できる。 In the drain pile 2 described above, the filter member 40 is fitted into the water intake hole 14 of the pile body 10, so gaps are unlikely to occur between the pile body 10 and the filter member 40 at the water intake hole 14. This allows the inflow of sediment to be sufficiently suppressed, and the pile body 10 is unlikely to become clogged with sediment, so the effect of draining underground water to the surface is fully exerted. In addition, since the filter member 40 is simply fitted into the water intake hole 14, the structure is simple and low cost, and the effect of suppressing sediment inflow can be easily imparted to existing pile bodies 10.

本発明においては、フィルタ部材３０のようなメッシュタイプのフィルタ部材は、容易に目を細かくでき、フィルタ部材４０のようなスリットタイプのフィルタ部材に比べ、より高い土砂流入抑制効果を得ることができる。一方、スリットタイプのフィルタ部材は、メッシュタイプのフィルタ部材に比べ、製造が容易でコストが低く、耐久性に優れる。 In the present invention, a mesh-type filter member such as filter member 30 can be easily made finer, and can achieve a higher effect of preventing sediment inflow than a slit-type filter member such as filter member 40. On the other hand, a slit-type filter member is easier to manufacture, less expensive, and more durable than a mesh-type filter member.

本発明のドレーン杭では、適用する地盤の種類や土砂のサイズによって、メッシュタイプのフィルタ部材とスリットタイプのフィルタ部材とを使い分けることができる。例えば、土砂のサイズが小さい地盤にはメッシュタイプのフィルタ部材を備えるドレーン杭を使用し、土砂のサイズが大きい地盤にはスリットタイプのフィルタ部材を備えるドレーン杭を使用することができる。例えば、深さによって土砂のサイズが異なる地盤には、メッシュタイプのフィルタ部材とスリットタイプのフィルタ部材を併用したドレーン杭を使用してもよい。 In the drain pile of the present invention, a mesh-type filter member and a slit-type filter member can be used depending on the type of ground and size of the soil to which it is applied. For example, a drain pile equipped with a mesh-type filter member can be used for ground with small soil size, and a drain pile equipped with a slit-type filter member can be used for ground with large soil size. For example, a drain pile that combines a mesh-type filter member and a slit-type filter member can be used for ground where the size of the soil varies depending on the depth.

なお、本発明の技術的範囲は前記した実施形態例に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。例えば、本発明のドレーン杭は、上部水抜き材２０を備えないものであってもよい。本発明の趣旨に逸脱しない範囲で、前記実施形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、前記した変形例を適宜組み合わせてもよい。 The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the drain pile of the present invention may not include the upper drainage material 20. The components in the above-described embodiment may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-described modified examples may be combined as appropriate.

１，２…ドレーン杭、１０…杭本体、１２…周壁部、１４…吸水孔、１６…下端部、２０…上部水抜き材、３０…フィルタ部材、３２…嵌込部、３２ａ…リブ、３４…蓋部、３６…メッシュ部材、３８…通水部、４０…フィルタ部材、４２…嵌込部、４２ａ…リブ、４４…蓋部、４６…通水部、４８…スリット。 1, 2...Drain pile, 10...Pile body, 12...Peripheral wall, 14...Water intake hole, 16...Lower end, 20...Upper drainage material, 30...Filter member, 32...Insertion portion, 32a...Rib, 34...Cover portion, 36...Mesh member, 38...Water passage portion, 40...Filter member, 42...Insertion portion, 42a...Rib, 44...Cover portion, 46...Water passage portion, 48...Slit.

Claims (2)

地盤に埋め込む管状のドレーン杭であって、
周壁部に１つ以上の吸水孔を有する杭本体と、土砂の流入を抑制するためのフィルタ部材と、を備え、
前記フィルタ部材は、前記吸水孔に嵌め込まれる筒状の嵌込部と、前記嵌込部の先端部に取り付けられた板状の蓋部と、前記蓋部の中央部分に開口した通水部に設けられたメッシュ部材とを備え、
前記嵌込部の外面には、前記嵌込部の軸方向に延びる複数のリブが周方向に間隔をあけて設けられ、
前記嵌込部が吸水孔に嵌め込まれた状態において、前記メッシュ部材は、前記嵌込部の先端と前記蓋部で挟持されることにより、前記フィルタ部材における前記杭本体の外周面側の先端部に位置する通水部に配置されている、ドレーン杭。 A tubular drain pile to be embedded in the ground,
The pile body has one or more water suction holes in a peripheral wall portion, and a filter member for suppressing the inflow of soil and sand.
The filter member includes a cylindrical fitting portion that is fitted into the water intake hole , a plate-shaped lid portion that is attached to a tip end of the fitting portion, and a mesh member that is provided in a water passage portion that opens in a central portion of the lid portion ,
A plurality of ribs extending in an axial direction of the fitting portion are provided on an outer surface of the fitting portion at intervals in a circumferential direction,
A drain pile in which, when the insertion portion is inserted into the water intake hole , the mesh member is clamped between the tip of the insertion portion and the cover portion, and is positioned in a water passage portion located at the tip portion of the outer circumferential surface side of the pile main body in the filter member . 地盤に埋め込む管状のドレーン杭であって、
周壁部に１つ以上の吸水孔を有する杭本体と、土砂の流入を抑制するためのフィルタ部材と、を備え、
前記フィルタ部材は、前記吸水孔に嵌め込まれる筒状の嵌込部と、前記嵌込部の先端部に取り付けられた板状の蓋部とを備え、
前記嵌込部の外面には、前記嵌込部の軸方向に延びる複数のリブが周方向に間隔をあけて設けられ、
前記フィルタ部材の前記嵌込部が前記吸水孔に嵌め込まれ、
前記フィルタ部材における前記蓋部の中央部分の通水部に複数のスリットが平行に形成されており、
前記蓋部を前記スリットの幅方向に切断したときの前記スリットの断面形状が、前記スリットの幅が前記蓋部の表面側から裏面側に向かって広がっている、ドレーン杭。 A tubular drain pile to be embedded in the ground,
The pile body has one or more water suction holes in a peripheral wall portion, and a filter member for suppressing the inflow of soil and sand.
The filter member includes a cylindrical fitting portion that is fitted into the water intake hole, and a plate-shaped lid portion that is attached to a tip end of the fitting portion,
A plurality of ribs extending in an axial direction of the fitting portion are provided at intervals in a circumferential direction on an outer surface of the fitting portion,
The fitting portion of the filter member is fitted into the water intake hole,
A plurality of slits are formed in parallel in the water passage portion in the central portion of the lid portion of the filter member ,
A drain pile in which the cross-sectional shape of the slit when the cover portion is cut in the width direction of the slit is such that the width of the slit increases from the front side to the back side of the cover portion.
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JP2004202457A (en) 2002-12-26 2004-07-22 Nagoya Oil Chem Co Ltd Masking material
JP2005331065A (en) 2004-05-21 2005-12-02 Yazaki Corp Boss structure and metal mold for molding plate-like member having this boss structure
JP2015218768A (en) 2014-05-15 2015-12-07 株式会社パイオラックス Fixture

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JP2663599B2 (en) * 1988-12-28 1997-10-15 住友金属工業株式会社 Perforated pipe for liquefaction countermeasures and method of manufacturing the same
JP2890869B2 (en) * 1991-03-19 1999-05-17 住友金属工業株式会社 Sheet pile with drainage function, method of manufacturing the same, and plug

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JP2004202457A (en) 2002-12-26 2004-07-22 Nagoya Oil Chem Co Ltd Masking material
JP2005331065A (en) 2004-05-21 2005-12-02 Yazaki Corp Boss structure and metal mold for molding plate-like member having this boss structure
JP2015218768A (en) 2014-05-15 2015-12-07 株式会社パイオラックス Fixture

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